2 * dat.c - NILFS disk address translation.
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Written by Koji Sato <koji@osrg.net>.
23 #include <linux/types.h>
24 #include <linux/buffer_head.h>
25 #include <linux/string.h>
26 #include <linux/errno.h>
33 #define NILFS_CNO_MIN ((__u64)1)
34 #define NILFS_CNO_MAX (~(__u64)0)
36 static int nilfs_dat_prepare_entry(struct inode *dat,
37 struct nilfs_palloc_req *req, int create)
39 return nilfs_palloc_get_entry_block(dat, req->pr_entry_nr,
40 create, &req->pr_entry_bh);
43 static void nilfs_dat_commit_entry(struct inode *dat,
44 struct nilfs_palloc_req *req)
46 nilfs_mdt_mark_buffer_dirty(req->pr_entry_bh);
47 nilfs_mdt_mark_dirty(dat);
48 brelse(req->pr_entry_bh);
51 static void nilfs_dat_abort_entry(struct inode *dat,
52 struct nilfs_palloc_req *req)
54 brelse(req->pr_entry_bh);
57 int nilfs_dat_prepare_alloc(struct inode *dat, struct nilfs_palloc_req *req)
61 ret = nilfs_palloc_prepare_alloc_entry(dat, req);
65 ret = nilfs_dat_prepare_entry(dat, req, 1);
67 nilfs_palloc_abort_alloc_entry(dat, req);
72 void nilfs_dat_commit_alloc(struct inode *dat, struct nilfs_palloc_req *req)
74 struct nilfs_dat_entry *entry;
77 kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0);
78 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
79 req->pr_entry_bh, kaddr);
80 entry->de_start = cpu_to_le64(NILFS_CNO_MIN);
81 entry->de_end = cpu_to_le64(NILFS_CNO_MAX);
82 entry->de_blocknr = cpu_to_le64(0);
83 kunmap_atomic(kaddr, KM_USER0);
85 nilfs_palloc_commit_alloc_entry(dat, req);
86 nilfs_dat_commit_entry(dat, req);
89 void nilfs_dat_abort_alloc(struct inode *dat, struct nilfs_palloc_req *req)
91 nilfs_dat_abort_entry(dat, req);
92 nilfs_palloc_abort_alloc_entry(dat, req);
95 int nilfs_dat_prepare_free(struct inode *dat, struct nilfs_palloc_req *req)
99 ret = nilfs_palloc_prepare_free_entry(dat, req);
102 ret = nilfs_dat_prepare_entry(dat, req, 0);
104 nilfs_palloc_abort_free_entry(dat, req);
110 void nilfs_dat_commit_free(struct inode *dat, struct nilfs_palloc_req *req)
112 struct nilfs_dat_entry *entry;
115 kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0);
116 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
117 req->pr_entry_bh, kaddr);
118 entry->de_start = cpu_to_le64(NILFS_CNO_MIN);
119 entry->de_end = cpu_to_le64(NILFS_CNO_MIN);
120 entry->de_blocknr = cpu_to_le64(0);
121 kunmap_atomic(kaddr, KM_USER0);
123 nilfs_dat_commit_entry(dat, req);
124 nilfs_palloc_commit_free_entry(dat, req);
127 void nilfs_dat_abort_free(struct inode *dat, struct nilfs_palloc_req *req)
129 nilfs_dat_abort_entry(dat, req);
130 nilfs_palloc_abort_free_entry(dat, req);
133 int nilfs_dat_prepare_start(struct inode *dat, struct nilfs_palloc_req *req)
137 ret = nilfs_dat_prepare_entry(dat, req, 0);
138 BUG_ON(ret == -ENOENT);
142 void nilfs_dat_commit_start(struct inode *dat, struct nilfs_palloc_req *req,
145 struct nilfs_dat_entry *entry;
148 kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0);
149 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
150 req->pr_entry_bh, kaddr);
151 entry->de_start = cpu_to_le64(nilfs_mdt_cno(dat));
152 if (entry->de_blocknr != cpu_to_le64(0) ||
153 entry->de_end != cpu_to_le64(NILFS_CNO_MAX)) {
155 "%s: vbn = %llu, start = %llu, end = %llu, pbn = %llu\n",
156 __func__, (unsigned long long)req->pr_entry_nr,
157 (unsigned long long)le64_to_cpu(entry->de_start),
158 (unsigned long long)le64_to_cpu(entry->de_end),
159 (unsigned long long)le64_to_cpu(entry->de_blocknr));
162 entry->de_blocknr = cpu_to_le64(blocknr);
163 kunmap_atomic(kaddr, KM_USER0);
165 nilfs_dat_commit_entry(dat, req);
168 void nilfs_dat_abort_start(struct inode *dat, struct nilfs_palloc_req *req)
170 nilfs_dat_abort_entry(dat, req);
173 int nilfs_dat_prepare_end(struct inode *dat, struct nilfs_palloc_req *req)
175 struct nilfs_dat_entry *entry;
181 ret = nilfs_dat_prepare_entry(dat, req, 0);
183 BUG_ON(ret == -ENOENT);
187 kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0);
188 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
189 req->pr_entry_bh, kaddr);
190 start = le64_to_cpu(entry->de_start);
191 blocknr = le64_to_cpu(entry->de_blocknr);
192 kunmap_atomic(kaddr, KM_USER0);
195 ret = nilfs_palloc_prepare_free_entry(dat, req);
197 nilfs_dat_abort_entry(dat, req);
205 void nilfs_dat_commit_end(struct inode *dat, struct nilfs_palloc_req *req,
208 struct nilfs_dat_entry *entry;
213 kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0);
214 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
215 req->pr_entry_bh, kaddr);
216 end = start = le64_to_cpu(entry->de_start);
218 end = nilfs_mdt_cno(dat);
221 entry->de_end = cpu_to_le64(end);
222 blocknr = le64_to_cpu(entry->de_blocknr);
223 kunmap_atomic(kaddr, KM_USER0);
226 nilfs_dat_commit_free(dat, req);
228 nilfs_dat_commit_entry(dat, req);
231 void nilfs_dat_abort_end(struct inode *dat, struct nilfs_palloc_req *req)
233 struct nilfs_dat_entry *entry;
238 kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0);
239 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
240 req->pr_entry_bh, kaddr);
241 start = le64_to_cpu(entry->de_start);
242 blocknr = le64_to_cpu(entry->de_blocknr);
243 kunmap_atomic(kaddr, KM_USER0);
245 if (start == nilfs_mdt_cno(dat) && blocknr == 0)
246 nilfs_palloc_abort_free_entry(dat, req);
247 nilfs_dat_abort_entry(dat, req);
251 * nilfs_dat_mark_dirty -
252 * @dat: DAT file inode
253 * @vblocknr: virtual block number
257 * Return Value: On success, 0 is returned. On error, one of the following
258 * negative error codes is returned.
262 * %-ENOMEM - Insufficient amount of memory available.
264 int nilfs_dat_mark_dirty(struct inode *dat, __u64 vblocknr)
266 struct nilfs_palloc_req req;
269 req.pr_entry_nr = vblocknr;
270 ret = nilfs_dat_prepare_entry(dat, &req, 0);
272 nilfs_dat_commit_entry(dat, &req);
277 * nilfs_dat_freev - free virtual block numbers
278 * @dat: DAT file inode
279 * @vblocknrs: array of virtual block numbers
280 * @nitems: number of virtual block numbers
282 * Description: nilfs_dat_freev() frees the virtual block numbers specified by
283 * @vblocknrs and @nitems.
285 * Return Value: On success, 0 is returned. On error, one of the following
286 * nagative error codes is returned.
290 * %-ENOMEM - Insufficient amount of memory available.
292 * %-ENOENT - The virtual block number have not been allocated.
294 int nilfs_dat_freev(struct inode *dat, __u64 *vblocknrs, size_t nitems)
296 return nilfs_palloc_freev(dat, vblocknrs, nitems);
300 * nilfs_dat_move - change a block number
301 * @dat: DAT file inode
302 * @vblocknr: virtual block number
303 * @blocknr: block number
305 * Description: nilfs_dat_move() changes the block number associated with
306 * @vblocknr to @blocknr.
308 * Return Value: On success, 0 is returned. On error, one of the following
309 * negative error codes is returned.
313 * %-ENOMEM - Insufficient amount of memory available.
315 int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr)
317 struct buffer_head *entry_bh;
318 struct nilfs_dat_entry *entry;
322 ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh);
325 kaddr = kmap_atomic(entry_bh->b_page, KM_USER0);
326 entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
327 if (entry->de_blocknr == cpu_to_le64(0)) {
328 printk(KERN_CRIT "%s: vbn = %llu, [%llu, %llu)\n", __func__,
329 (unsigned long long)vblocknr,
330 (unsigned long long)le64_to_cpu(entry->de_start),
331 (unsigned long long)le64_to_cpu(entry->de_end));
334 BUG_ON(blocknr == 0);
335 entry->de_blocknr = cpu_to_le64(blocknr);
336 kunmap_atomic(kaddr, KM_USER0);
338 nilfs_mdt_mark_buffer_dirty(entry_bh);
339 nilfs_mdt_mark_dirty(dat);
347 * nilfs_dat_translate - translate a virtual block number to a block number
348 * @dat: DAT file inode
349 * @vblocknr: virtual block number
350 * @blocknrp: pointer to a block number
352 * Description: nilfs_dat_translate() maps the virtual block number @vblocknr
353 * to the corresponding block number.
355 * Return Value: On success, 0 is returned and the block number associated
356 * with @vblocknr is stored in the place pointed by @blocknrp. On error, one
357 * of the following negative error codes is returned.
361 * %-ENOMEM - Insufficient amount of memory available.
363 * %-ENOENT - A block number associated with @vblocknr does not exist.
365 int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp)
367 struct buffer_head *entry_bh;
368 struct nilfs_dat_entry *entry;
373 ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh);
377 kaddr = kmap_atomic(entry_bh->b_page, KM_USER0);
378 entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
379 blocknr = le64_to_cpu(entry->de_blocknr);
384 if (blocknrp != NULL)
388 kunmap_atomic(kaddr, KM_USER0);
393 ssize_t nilfs_dat_get_vinfo(struct inode *dat, struct nilfs_vinfo *vinfo,
396 struct buffer_head *entry_bh;
397 struct nilfs_dat_entry *entry;
400 unsigned long entries_per_block = NILFS_MDT(dat)->mi_entries_per_block;
403 for (i = 0; i < nvi; i += n) {
404 ret = nilfs_palloc_get_entry_block(dat, vinfo[i].vi_vblocknr,
408 kaddr = kmap_atomic(entry_bh->b_page, KM_USER0);
409 /* last virtual block number in this block */
410 first = vinfo[i].vi_vblocknr;
411 do_div(first, entries_per_block);
412 first *= entries_per_block;
413 last = first + entries_per_block - 1;
415 j < nvi && vinfo[j].vi_vblocknr >= first &&
416 vinfo[j].vi_vblocknr <= last;
418 entry = nilfs_palloc_block_get_entry(
419 dat, vinfo[j].vi_vblocknr, entry_bh, kaddr);
420 vinfo[j].vi_start = le64_to_cpu(entry->de_start);
421 vinfo[j].vi_end = le64_to_cpu(entry->de_end);
422 vinfo[j].vi_blocknr = le64_to_cpu(entry->de_blocknr);
424 kunmap_atomic(kaddr, KM_USER0);